Sport good of composite material with lighter weight and greater rigidity

Abstract

A sport good, such as hockey stick, Ping-Pong bat, baseball bat, ski stick and so on, has a rigid member made of a composite material. The rigid member has a chamber therein, in which a high-pressure gas is filled to make the sport good having both properties of lighter weight and greater rigidity.

1. A hockey stick, comprising:
 a rigid hollow shaft made from a carbon-fiber composite material having only a single chamber therein, and 
 a blade which is not hollow fixed to seal the opening at a first end of the hollow shaft; 
 wherein a plunger having an airway therethrough with a check valve therein closes a second end of the hollow shaft; and 
 wherein said single chamber is filled with a high-pressure gas at 8 Kg/cm 2 .